how to convert string to double c++ code example

Example 1: double to string c++

std::ostringstream strs;
strs << dbl;
std::string str = strs.str();

Example 2: how to convert a string to a double c++

double new = std::stod(string);

Example 3: c++ changing string to double

#include <iostream>
using namespace std;
int main() {
   char s[20] = "18.2894 is a number";
   char *p;
   double result;
   result = strtod(s, &p);
   cout<<"The number after conversion of string : "<<result;
   return(0);
}